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B. NEWBURY. LII'TING JACK.

No. 8,110. Patented May-27,1851.

Tan STATES PATENT ormon.

. B. NEWBURY, GA'I ESK-ILL, YORK.

' LIFTI GJAGK.

Specification of Letters mat No. 8,110, dated May 27, 1851.

To all whom it may concern Be it known that I, BOLIVER NEWBURY, of Catskill, in the county of Greene and State of New York, have invented a new and useful Improvement in a Jack for Lifting Weights or for other Purposes to which Jacks are Applied; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figures 1, and 2, are side elevations, part of the guide frame being broken away in each figure to show the working parts. Fig. 3 is a front elevation.

Similar letters of reference indicate corresponding parts in each of the several figures.

The nature of my invention consists, in an improved combination of ratchets, pawls, and springs, with a lever to which a pumping or vibrating motion is given for the purpose of throwing out or drawing in the lifting rod from or to the post or standard of the jack. a

To enable others skilled in the art to make and use my invention I will proceed to describe its construction and operation.

A, is the post or standard of the jack which is of timber, capped at each end with metal or it may be altogether of metal, it is hollow to admit the lifting rod B, which is of iron and provided on two opposite sides with ratchets a and b, the points of whose teeth are inclined toward the bottom, the points of the teeth of one ratchet being opposite the middle of the spaces between the points of those ofthe opposite ratchet. A

guide C, through which the rod B, passes and bywhich it is kept in line with the post A, is attached to the head of the post.

D, is the lever for operating the jack, it is divided at its front end into two cheeks or jaws c, c, which embrace the rod B, one being upon each side of it, the lever has its ful crum at d, d, which are short studs, one attached to each cheek, and resting in bearing boxes 6, e, secured to the top ofthe post A, the bar of the lever is made to unship.

f, f, are pawls hung on pins g, g, passing through the cheeks c, c, on opposite'sides of the rod B, the pawl f,jtakes into the ratchet a, and that 7" into the ratchet 5, each pawl has a small pin or stud h, on each side near its points. 2', i, are small steel bar springs hung upon pins jj outsideone cheek of the lever, they are caused to bear against the p ns 5), h, bythe motion of the lever D, for the purpose of releasing the pawls from the ratchets. The pins h, h,- on the oppositesides of the pawls are connected bya spiral spring 0, whlch has a tendency in gear with the ratchetsla, is a spring lever hung on a pin or fu lcrum Z, in the same cheek the spring 2', z", are hung, it has projections 1, 2, on each side of the fulcrum which are caused to bear on the springs 2', 2", for the purpose of keeping their ends at the required distance apart for operating on the pawls, the end of this lever is provided with a small pin m, which may be inserted in a hole n, in the side of the lever D, when necessary.

The operation is as follows: lVhen the power of the jack is to be applied for the purpose of llfting or hoistingthe bottom of the lever D, as

to keep them both of the post A is placed on a suitable foundadown resting on the pin 7', of the spring 9" or on any other pin inserted in the cheek of the lever D, for that purpose, (see Fig. 1.) this leaves the pawls under the control of the spiral spring 0. It will be seen by reference to Fig. 1, that the lever D, is pressed clown and one tooth of the ratchet b, rests on the pawl f, the pawl f being just falling over the edge of a tooth of the opposite ratchet a; as soon as the end of the lever D, is raised the pawl 7, takes the weight and raises the bar B, the pawl f, descending until the upward stroke of the lever is fin ished. When the pawl f, falls over the edge of the tooth on the ratchet Z2, and is ready for taking its lift when the end of the lever D, is lowered; by continuing the vibrating or pumping motion of the lever the rod may be forced out any distance and the weight hoisted. When it is desired to draw in or lower the rod B, the end of the small spring lever is, is raised and the pin in its end inserted in the hole a, (see Fig. 2) the projections 1, 2, on each side of the fulcrum Z,.then bear on each of the springs a", and hold them back, but not sufficiently far to release the pawls from the ratchet. It will be seen by referring to Fig. 2, that the lever D, is represented raised and thepawl f, supporting the weight, the pawl i, being thrown back of the spring 71, clear of the teeth of the ratchet b; when the lever D, is lowered the rod B, descends and the pawl f, moves up to the next tooth of the ratchet b and receives the weight the spring c then coming in contact with the pin it, on the pawl f, throws back that pawl and releases 'it from the ratchet a, leaving the whole weight of the rod B, on the pawl f; the motion of the lever D being reversed the rod again descends moving one tooth for every stroke of the lever.

If the pawls and springs &c. be well fitted the rod B, will descend of its own weight when the bar of the lever is unstripped from the socket in which it fits.

I do not claim any of the parts employed irrespective of the manner in which they are combined and arranged, but

What I claim as new and desire to secure by Letters Patent is The combination in the manner substantially as herein described of the pawls f, f, the springs o and z, i, and the spring lever 70, having projections 1, 2, on each side of its fulcrum with the lever- D, and the ratchets a, b, on the lifting rod B, whereby the lifting rod may be forced out from or drawn in to the post, or standard of the jack according to the position of the spring lever.

BOLIVER NEWBURY.

'Witnesses A. H. BAILEY, R0121. DORLON. 

